Merge "Include what we use."
am: a9c7e6d152

Change-Id: I684f602e5e5b8b3c95a98f34860dcf8907200a9e
diff --git a/vulkan/nulldrv/null_driver.cpp b/vulkan/nulldrv/null_driver.cpp
index b4ca42c..e2d5c83 100644
--- a/vulkan/nulldrv/null_driver.cpp
+++ b/vulkan/nulldrv/null_driver.cpp
@@ -16,6 +16,7 @@
 
 #include <hardware/hwvulkan.h>
 
+#include <errno.h>
 #include <inttypes.h>
 #include <stdlib.h>
 #include <string.h>